期刊
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
卷 120, 期 6, 页码 3937-3957出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2014JC010561
关键词
wave energy dissipation; thermal infrared imagery; surf zone; wave breaking; remote sensing
类别
资金
- DARLA-MURI from the Office of Naval Research [N000141010932]
- NDIA UWD Academic Fellowship Program
Thermal infrared (IR) imagery is used to quantify the high spatial and temporal variability of dissipation due to wave breaking in the surf zone. The foam produced in an actively breaking crest, or wave roller, has a distinct signature in IR imagery. A retrieval algorithm is developed to detect breaking waves and extract wave roller length using measurements taken during the Surf Zone Optics 2010 experiment at Duck, NC. The remotely derived roller length and an in situ estimate of wave slope are used to estimate dissipation due to wave breaking by means of the wave-resolving model by Duncan (1981). The wave energy dissipation rate estimates show a pattern of increased breaking during low tide over a sand bar, consistent with in situ turbulent kinetic energy dissipation rate estimates from fixed and drifting instruments over the bar. When integrated over the surf zone width, these dissipation rate estimates account for 40-69% of the incoming wave energy flux. The Duncan (1981) estimates agree with those from a dissipation parameterization by Janssen and Battjes (2007), a wave energy dissipation model commonly applied within nearshore circulation models.
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